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行波法故障测距不受系统参数、运行方式、线路不对称性及互感器变化误差等因素的影响,构成简单、容易实现。该方法通过检测行波在故障点及检测端之间往返一次的时间或利用故障点行波到达线路两端的时间差来计算故障距离,具有测距速度快、精度高的优点。本文介绍了A、B、C、E这4种行波测距方法的原理及其各自的优缺点。通过对10kV多分支配电线路单相接地故障进行仿真,比较正常线路和故障线路波形,找到了第一个波形畸变点并以此来确定故障距离。结果表明测距精度满足实际要求,从而验证了C型行波法在配电网故障测距中的可行性。
Traveling wave method fault location is not affected by the system parameters, operating mode, line asymmetry and transformer error and other factors, the structure is simple and easy to implement. The method calculates the fault distance by detecting the traveling time of the traveling wave between the fault point and the detecting end or using the time difference between the arrival of the traveling wave of the fault point and the two ends of the line, which has the advantages of fast ranging speed and high precision. This paper introduces the principles of A, B, C and E four kinds of traveling wave ranging methods and their respective advantages and disadvantages. By simulating the single-phase ground fault of 10kV multi-branch distribution line and comparing the waveform of normal line and fault line, the first waveform distortion point was found and the fault distance was determined. The results show that the ranging accuracy meets the actual requirements, which verifies the feasibility of C-wave traveling wave method in fault location of distribution network.